Annual report pursuant to Section 13 and 15(d)

Segments (Detail)

v3.6.0.2
Segments (Detail) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Segment Reporting Information      
Goodwill impairment loss $ 0 $ 0 $ 0
Goodwill 115,207,000 115,369,000 100,153,000
Operating Segments | Aerospace Segment      
Segment Reporting Information      
Goodwill impairment loss 0 0 0
Purchased intangible impairment loss 0 0 0
Goodwill 115,200,000 115,400,000  
Operating Segments | Test Systems Segment      
Segment Reporting Information      
Goodwill impairment loss 0 0 0
Purchased intangible impairment loss 0 0 $ 0
Goodwill $ 0 $ 0